Nope, not a stencil. Roth made baris. There was one for sale just recently. The seller contacted me ahead of time asking me if I knew anyone looking for one. Too bad it hadn't come up a few years ago when I was looking for a low A bari, I would have likely bought it.
I have photos of a couple different baris, both in silver plate. One with Wero engraving, the other with Migma on the bell. I haven't uploaded them to my gallery yet though... I'm really behind...
Roth made altos, tenors, and baris. To my knowledge he didn't make sopranos, but I might be wrong on that. I haven't seen any, and haven't seen them mentioned either. That said, his business was in operation from 1949-1972, so it's possible there may have been some made, but that they fell through the cracks and haven't been spotted.